Stock-Based Compensation - Stock options activity (Details) - Stock options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($) $ / shares shares
Number of options
Outstanding at the beginning of the year (in shares) | shares	170
Exercised (in shares) | shares	(33)
Outstanding at the end of the year (in shares) | shares	137
Vested and expected to vest at the end of the year (in shares) | shares	83
Exercisable at the end of the year (in shares) | shares	50
Weighted-Average Exercise Price
Outstanding at the beginning of the year (in dollars per share) | $ / shares	$ 38.88
Exercised (in dollars per share) | $ / shares	36.45
Outstanding at the end of the year (in dollars per share) | $ / shares	39.47
Vested and expected to vest at the end of the year (in dollars per share) | $ / shares	40.39
Exercisable at the end of the year (in dollars per share) | $ / shares	$ 37.88
Weighted-Average Remaining Contractual Term (In years)
Outstanding at the end of the year	7 years 1 month 6 days
Vested and expected to vest at the end of the year	7 years 1 month 6 days
Exercisable at the end of the year	7 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding at the end of the year (in dollars) | $	$ 5,327
Vested and expected to vest at the end of the year (in dollars) | $	3,154
Options exercisable at the end of the year (in dollars) | $	$ 2,031